I guarantee you AI will not end the world

No one serious is arguing it will destroy the world (outside of LLM companies using these people as free marketing), the real critics argue that this is going to weaken labor while all the benefits go to the few capitalists and nothing ultimately improves in regards to society.

Unless improvement for you means increase cancer rates, exacerbating the climate crisis, or using poor systems to kill school children in wars.

All outcomes humans with souls typically want to avoid.

I never said it did, "doom" in this case is just "any negative consequences of AI", because anyone saying that AI could lead to negative consequences has been accused of "doomerism". My point is simply that the negative consequences are here right now, in the room with us, and AI boosters are still pretending that they don't exist.